Adding getObject that accepts Gson TypeToken

[Megamiun]

Hello,

I really loved your library, it helped me testing some features in my prototype.

But, using maps in Kotlin, I had some difficulties trying to get the map automatically filled. After some time trying to make things work, I remembered that Gson has a TypeToken interface that solved cases like that.

Sincerely, I already made a fork from your project and created the method, it worked perfectly here. I think it would be a good addition to your project, so I am going to create a PR. Hope you can accept it soon, as I would prefer to add your lib on gradle instead of maintaining a module adjacent to my project.